Design of an X-band photoinjector operating at 1 KHZ

W. S. Graves, A. C. Goodrich, M. R. Holl, N. J. O'Brien, V. Bharadwaj, P. Borchard, V. Dolgashev, E. A. Nanni

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

A kHz repetition rate RF photoinjector with novel features has been designed for the ASU CXLS project. The photoinjector consists of a 9.3 GHz 4.5 cell standing-wave RF cavity that is constructed from 2 halves. The halves are brazed together, with the braze joint bisecting the irises and cells, greatly simplifying its construction. The cathode is brazed onto this assembly. RF power is coupled into the cavity through inline circular waveguide using a demountable TM01 mode launcher. The mode launcher feeds the power through 4 ports distributed azimuthally to eliminate both dipole and quadrupole field distortions. The brazed-in cathode and absence of complex power coupler result in a very inexpensive yet high performance device. The clean design allows the RF cavity to sit entirely within the solenoid assembly. The cathode gradient is 120 MV/m at 3 MW of input power. The cathode cell is just 0.17 RF wavelength so that laser arrival phase for peak acceleration is 70 degrees from zero crossing resulting in exit energy of 4 MeV. The photoinjector will operate with 1 µs pulses at 1 kHz, dissipating 3 kW of heat. Details of the design are presented.

Original languageEnglish (US)
Title of host publicationIPAC 2017 - Proceedings of the 8th International Particle Accelerator Conference
PublisherJoint Accelerator Conferences Website - JACoW
Pages1659-1662
Number of pages4
ISBN (Electronic)9783954501823
StatePublished - Jul 2017
Externally publishedYes
Event8th International Particle Accelerator Conference, IPAC 2017 - Bella Conference Center, Denmark
Duration: May 14 2017May 19 2017

Publication series

NameIPAC 2017 - Proceedings of the 8th International Particle Accelerator Conference

Conference

Conference8th International Particle Accelerator Conference, IPAC 2017
Country/TerritoryDenmark
CityBella Conference Center
Period5/14/175/19/17

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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